View Compilation Error

0_0_28901908_16941.cpp: In function 'double abs(int)':
0_0_28901908_16941.cpp:13:17: error: ambiguating new declaration of 'double abs(int)'
 double abs(int x)
                 ^
In file included from 0_0_28901908_16941.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:205:15: note: old declaration 'int abs(int)'
   int __cdecl abs(int _X);
               ^